package com.aimashi.aimashicodesandbox;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.resource.ResourceUtil;
import cn.hutool.core.util.ArrayUtil;
import cn.hutool.core.util.StrUtil;
import com.github.dockerjava.api.DockerClient;
import com.github.dockerjava.api.async.ResultCallback;
import com.github.dockerjava.api.command.*;
import com.github.dockerjava.api.model.*;
import com.github.dockerjava.core.DockerClientBuilder;
import com.github.dockerjava.core.command.ExecStartResultCallback;
import com.aimashi.aimashicodesandbox.model.ExecuteCodeRequest;
import com.aimashi.aimashicodesandbox.model.ExecuteCodeResponse;
import com.aimashi.aimashicodesandbox.model.ExecuteMessage;
import com.aimashi.aimashicodesandbox.model.JudgeInfo;
import com.aimashi.aimashicodesandbox.utils.ProcessUtils;
import org.springframework.util.StopWatch;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;

public class JavaDockerCodeSandboxOld implements CodeSandbox{
    private static final String GLOBAL_CODE_DIR_NAME = "temCOde";

    private static final String GLOBAL_JAVA_CLASS_NAME = "Main.java";

    private static final long TIME_OUT = 5000L;

    private static final String SECURITY_MANAGER_PATH = "src/main/resources/security";

    private static final String SECURITY_MANAGER_CLASS_NAME = "MySecurityManager";

    private static final Boolean FIRST_INIT = true;

    public static void main(String[] args) {
        JavaDockerCodeSandboxOld javaNativeCodeSandbox = new JavaDockerCodeSandboxOld();
        ExecuteCodeRequest executeCodeRequest = new ExecuteCodeRequest();
        executeCodeRequest.setInputList(Arrays.asList("1 2", "1 3"));
        String code = ResourceUtil.readStr("testCode/simpleComputeArgs/Main.java", StandardCharsets.UTF_8);
        System.out.println("java程序代码："+code);
//        String code = ResourceUtil.readStr("testCode/unsafeCode/RunFileError.java", StandardCharsets.UTF_8);
//        String code = ResourceUtil.readStr("testCode/simpleCompute/Main.java", StandardCharsets.UTF_8);
        executeCodeRequest.setCode(code);
        executeCodeRequest.setLanguage("java");
        ExecuteCodeResponse executeCodeResponse = javaNativeCodeSandbox.executeCode(executeCodeRequest);
        System.out.println("executeCodeResponse:"+executeCodeResponse);
    }

    @Override
    public ExecuteCodeResponse executeCode(ExecuteCodeRequest executeCodeRequest) {
//        System.setSecurityManager(new DenySecurityManager());

        List<String> inputList = executeCodeRequest.getInputList();
        String code = executeCodeRequest.getCode();
        String language = executeCodeRequest.getLanguage();

//        1. 把用户的代码保存为文件

        String userDir = System.getProperty("user.dir");
        String globalCodePathName = userDir + File.separator + GLOBAL_CODE_DIR_NAME;
        // 判断全局代码目录是否存在，没有则新建
        if (!FileUtil.exist(globalCodePathName)) {
            FileUtil.mkdir(globalCodePathName);
        }

        // 把用户的代码隔离存放
        String userCodeParentPath = globalCodePathName + File.separator + UUID.randomUUID();
        String userCodePath = userCodeParentPath + File.separator + GLOBAL_JAVA_CLASS_NAME;
        File userCodeFile = FileUtil.writeString(code, userCodePath, StandardCharsets.UTF_8);

//        2. 编译代码，得到 class 文件
        String compileCmd = String.format("javac -encoding utf-8 %s", userCodeFile.getAbsolutePath());
        try {
            Process compileProcess = Runtime.getRuntime().exec(compileCmd);
            ExecuteMessage executeMessage = ProcessUtils.runProcessAndGetMessage(compileProcess, "编译");
            System.out.println("executeMessage:"+executeMessage);
        } catch (Exception e) {
            return getErrorResponse(e);
        }

        // 3. 创建容器，把文件复制到容器内
        // 获取默认的 Docker Client
        DockerClient dockerClient = DockerClientBuilder.getInstance().build();

        // 拉取镜像
        String image = "openjdk:8-alpine";
        if (FIRST_INIT) {
            PullImageCmd pullImageCmd = dockerClient.pullImageCmd(image);
            PullImageResultCallback pullImageResultCallback = new PullImageResultCallback() {
                @Override
                public void onNext(PullResponseItem item) {
                    System.out.println("下载镜像：" + item.getStatus());
                    super.onNext(item);
                }
            };
            try {
                pullImageCmd
                        .exec(pullImageResultCallback)
                        .awaitCompletion();
            } catch (InterruptedException e) {
                System.out.println("拉取镜像异常");
                throw new RuntimeException(e);
            }
        }

        System.out.println("下载完成");

        // 创建容器
//        String profileConfig = ResourceUtil.readUtf8Str("/etc/docker/seccomp/default.json");

        CreateContainerCmd containerCmd = dockerClient.createContainerCmd(image);
        HostConfig hostConfig = new HostConfig();
        hostConfig.withMemory(100 * 1000 * 1000L);
        hostConfig.withMemorySwap(0L);
        hostConfig.withCpuCount(1L);
//        hostConfig.withSecurityOpts(Arrays.asList("seccomp=" + profileConfig));
        hostConfig.setBinds(new Bind(userCodeParentPath, new Volume("/app")));
        System.out.println("创建文件目录："+hostConfig.getBinds());
        CreateContainerResponse createContainerResponse = containerCmd
                .withHostConfig(hostConfig)
                .withNetworkDisabled(true)
                .withReadonlyRootfs(true)
                .withAttachStdin(true)
                .withAttachStderr(true)
                .withAttachStdout(true)
                .withTty(true)
                .exec();
        System.out.println("createContainerResponse:"+createContainerResponse);
        String containerId = createContainerResponse.getId();

//        // 启动容器
        dockerClient.startContainerCmd(containerId).exec();
//
//        // docker exec keen_blackwell java -cp /app Main 1 3
//        // 执行命令并获取结果
//        List<ExecuteMessage> executeMessageList = new ArrayList<>();
//        for (String inputArgs : inputList) {
//            StopWatch stopWatch = new StopWatch();
//            String[] inputArgsArray = inputArgs.split(" ");
//            String[] cmdArray = ArrayUtil.append(new String[]{"java", "-cp", "/app", "Main"}, inputArgsArray);
//            ExecCreateCmdResponse execCreateCmdResponse = dockerClient.execCreateCmd(containerId)
//                    .withCmd(cmdArray)
//                    .withAttachStderr(true)
//                    .withAttachStdin(true)
//                    .withAttachStdout(true)
//                    .exec();
//            System.out.println("创建执行命令：" + execCreateCmdResponse);
//
//            ExecuteMessage executeMessage = new ExecuteMessage();
//            final String[] message = {null};
//            final String[] errorMessage = {null};
//            long time = 0L;
//            // 判断是否超时
//            final boolean[] timeout = {true};
//            String execId = execCreateCmdResponse.getId();
//            ExecStartResultCallback execStartResultCallback = new ExecStartResultCallback() {
//                @Override
//                public void onComplete() {
//                    // 如果执行完成，则表示没超时
//                    timeout[0] = false;
//                    super.onComplete();
//                }
//
//                @Override
//                public void onNext(Frame frame) {
//                    StreamType streamType = frame.getStreamType();
//                    if (StreamType.STDERR.equals(streamType)) {
//                        errorMessage[0] = new String(frame.getPayload());
//                        System.out.println("输出错误结果：" + errorMessage[0]);
//                    } else {
//                        message[0] = new String(frame.getPayload());
//                        System.out.println("输出结果：" + message[0]);
//                    }
//                    super.onNext(frame);
//                }
//            };
//
//            final long[] maxMemory = {0L};
//
//            // 获取占用的内存
//            StatsCmd statsCmd = dockerClient.statsCmd(containerId);
//            ResultCallback<Statistics> statisticsResultCallback = statsCmd.exec(new ResultCallback<Statistics>() {
//
//                @Override
//                public void onNext(Statistics statistics) {
//                    System.out.println("内存占用：" + statistics.getMemoryStats().getUsage());
//                    maxMemory[0] = Math.max(statistics.getMemoryStats().getUsage(), maxMemory[0]);
//                }
//
//                @Override
//                public void close() throws IOException {
//
//                }
//
//                @Override
//                public void onStart(Closeable closeable) {
//
//                }
//
//                @Override
//                public void onError(Throwable throwable) {
//
//                }
//
//                @Override
//                public void onComplete() {
//
//                }
//            });
//            statsCmd.exec(statisticsResultCallback);
//            try {
//                stopWatch.start();
//                dockerClient.execStartCmd(execId)
//                        .exec(execStartResultCallback)
//                        .awaitCompletion(TIME_OUT, TimeUnit.MICROSECONDS);
//                stopWatch.stop();
//                time = stopWatch.getLastTaskTimeMillis();
//                statsCmd.close();
//            } catch (InterruptedException e) {
//                System.out.println("程序执行异常");
//                throw new RuntimeException(e);
//            }
//            executeMessage.setMessage(message[0]);
//            executeMessage.setErrorMessage(errorMessage[0]);
//            executeMessage.setTime(time);
//            executeMessage.setMemory(maxMemory[0]);
//            executeMessageList.add(executeMessage);
//        }
        // 执行命令并获取结果
        List<ExecuteMessage> executeMessageList = new ArrayList<>();
        for (String inputArgs : inputList) {
            StopWatch stopWatch = new StopWatch();
            String[] inputArgsArray = inputArgs.split(" ");
            String[] cmdArray = ArrayUtil.append(new String[]{"java", "-cp", "/app", "Main"}, inputArgsArray);

            // 1. 创建执行命令
            ExecCreateCmdResponse execCreateCmdResponse = dockerClient.execCreateCmd(containerId)
                    .withCmd(cmdArray)
                    .withAttachStderr(true)
                    .withAttachStdout(true)
                    .exec();
            String execId = execCreateCmdResponse.getId();

            // 2. 初始化结果变量
            ExecuteMessage executeMessage = new ExecuteMessage();
            final StringBuilder messageBuilder = new StringBuilder();  // 使用 StringBuilder 避免覆盖
            final StringBuilder errorMessageBuilder = new StringBuilder();
            final boolean[] timeout = {true};
            final long[] maxMemory = {0L};

            // 3. 定义结果回调
            ExecStartResultCallback execStartResultCallback = new ExecStartResultCallback() {
                @Override
                public void onNext(Frame frame) {
                    StreamType streamType = frame.getStreamType();
                    String payload = new String(frame.getPayload());
                    if (StreamType.STDERR.equals(streamType)) {
                        errorMessageBuilder.append(payload);
                        System.out.println("[ERROR] 错误：" + payload);
                    } else {
                        messageBuilder.append(payload);
                        System.out.println("[OUTPUT] " + payload);
                    }
                    super.onNext(frame);
                }

                @Override
                public void onComplete() {
                    timeout[0] = false;
                    System.out.println("命令执行完成");
                    super.onComplete();
                }
            };

            // 4. 启动内存监控（异步）
            StatsCmd statsCmd = dockerClient.statsCmd(containerId);
            AtomicBoolean statsDone = new AtomicBoolean(false);
            statsCmd.exec(new ResultCallback<Statistics>() {
                @Override
                public void onStart(Closeable closeable) {
                    System.out.println("内存监控启动");
                }

                @Override
                public void onNext(Statistics statistics) {
                    long memoryUsage = statistics.getMemoryStats().getUsage() != null ?
                            statistics.getMemoryStats().getUsage() : 0;
                    maxMemory[0] = Math.max(memoryUsage, maxMemory[0]);
                    System.out.println("[MEMORY] 当前内存占用: " + memoryUsage + "B");
                }

                @Override
                public void onError(Throwable throwable) {
                    System.err.println("内存监控错误: " + throwable.getMessage());
                    statsDone.set(true);
                }

                @Override
                public void onComplete() {
                    System.out.println("内存监控结束");
                    statsDone.set(true);
                }

                @Override
                public void close() throws IOException {
                    statsDone.set(true);
                }
            });

            // 5. 执行命令并等待结果
            stopWatch.start();
            try {
                dockerClient.execStartCmd(execId)
                        .exec(execStartResultCallback)
                        .awaitCompletion(30, TimeUnit.SECONDS); // 设置合理超时时间（如30秒）
            } catch (InterruptedException e) {
                throw new RuntimeException("命令执行被中断", e);
            } finally {
                stopWatch.stop();
                statsCmd.close(); // 关闭内存监控
            }

            // 6. 收集结果
//            executeMessage.setOutputMessage(messageBuilder.toString());
            executeMessage.setMessage(messageBuilder.toString());
            executeMessage.setErrorMessage(errorMessageBuilder.toString());
            executeMessage.setTime(stopWatch.getLastTaskTimeMillis());
            executeMessage.setMemory(maxMemory[0]);

            // 7. 获取退出码
            InspectExecResponse inspectExecResponse = dockerClient.inspectExecCmd(execId).exec();
            executeMessage.setExitValue(inspectExecResponse.getExitCode());

            executeMessageList.add(executeMessage);
        }

        // 4、封装结果，跟原生实现方式完全一致
        ExecuteCodeResponse executeCodeResponse = new ExecuteCodeResponse();
        List<String> outputList = new ArrayList<>();
        // 取用时最大值，便于判断是否超时
        long maxTime = 0;
        for (ExecuteMessage executeMessage : executeMessageList) {
            String errorMessage = executeMessage.getErrorMessage();
            if (StrUtil.isNotBlank(errorMessage)) {
                executeCodeResponse.setMessage(errorMessage);
                // 用户提交的代码执行中存在错误
                executeCodeResponse.setStatus(3);
                break;
            }
            outputList.add(executeMessage.getMessage());
            Long time = executeMessage.getTime();
            if (time != null) {
                maxTime = Math.max(maxTime, time);
            }
        }
        // 正常运行完成
        if (outputList.size() == executeMessageList.size()) {
            executeCodeResponse.setStatus(1);
        }
        executeCodeResponse.setOutputList(outputList);
        JudgeInfo judgeInfo = new JudgeInfo();
        judgeInfo.setTime(maxTime);
        // 要借助第三方库来获取内存占用，非常麻烦，此处不做实现
//        judgeInfo.setMemory();

        executeCodeResponse.setJudgeInfo(judgeInfo);

//        5. 文件清理
        if (userCodeFile.getParentFile() != null) {
            boolean del = FileUtil.del(userCodeParentPath);
            System.out.println("删除" + (del ? "成功" : "失败"));
        }
        return executeCodeResponse;
    }

    /**
     * 获取错误响应
     *
     * @param e
     * @return
     */
    private ExecuteCodeResponse getErrorResponse(Throwable e) {
        ExecuteCodeResponse executeCodeResponse = new ExecuteCodeResponse();
        executeCodeResponse.setOutputList(new ArrayList<>());
        executeCodeResponse.setMessage(e.getMessage());
        // 表示代码沙箱错误
        executeCodeResponse.setStatus(2);
        executeCodeResponse.setJudgeInfo(new JudgeInfo());
        return executeCodeResponse;
    }
}
